Daniel 7:19
Then desired I to be sure, concerning the fourth wild beast, which was diverse from all of them, - exceeding terrible, whose, teeth, were iron, and, his claws, of bronze, he devoured, brake in pieces, and, the residue - with his feet, he trampled down;
Daniel 7:7
After that, I was looking in the visions of the night, when lo! a fourth wild beast, terrible and well-hipped and exceeding strong, and it had, large teeth of iron, it devoured and brake in pieces, and, the residue - with its feet, it trampled down, - and, it, was diverse from all the wild beasts that were before it, and it had, ten horns.
Daniel 2:40-43
And, the fourth kingdom, shall be hard as iron, - in like manner as iron breaketh in pieces and crusheth all things, - even as iron which bringeth to ruins all these, shall it break in pieces and bring to ruins.